Dynamo-electric machine.



n.' E. HELLMUND & n. E. mms. DYNAMO ELECTRIC MACHINE.

APPLICATION FILED, FEBl 3, 916.

1,301,844 Patented Apr. 29, 1919.

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UNITED; srArEs RUDOLF E. HELLMuNn-orfrrrrsnunen ANDRALPH E. Eisma orSmau.;

PENNSYLVANIA, ASSIGNOBS TO WESTINGHOUSE ELECTRIC: MANUFCTIIB,ING-GOMPAN.Y, AfCOBIORATIONr OF- PENNSYLVAH DYNAMQFELEGTRIC MACHINE.

To all whom t may concern; i

Be it known that we, RUDOLF E. HELL- MUND, a subject of theEinperor ofGermany,

- and a resident of Pittsburgh, inthe county of Allegheny; andY State,of Pennsylvania, and RALPH E. FERRIS, a citizen of the lUnited States,and a resident of Swissvale, in the county of Allegheny and State ofPennsyl- .vania, have invented a new and usefulv Im-` provement inDynamo-Electric Machines, of

which the following is a specification.

Our invention relates to'/ dynamo-electric machines andparticularlytothe ventilation of heavy-duty motors severally comprising a pluralitylof pairsV of relatively rotatable magnetizable members carriedv withinan inclosing frame and mounted ,on a single shaft.

One object of our invention' is to provide a system of ventilation inwhich the ventilating medium is causedto pass through and between` theseveral magnetizable members of the motor and over portions of thecurrent-carrying; conductors. y

A further object of ourinvention is to provide a novel'form of armaturecoil ythat is; particularly4 adapted for use in connection withV ourinvention.

In the constructionfo motors for electric` mutator Y' cylinder lgivecommutatingY` conditions.' WeI propose, therefore', to constructfamotorinwhichthearmature issubdivided and provided witha plurality' ofseparate armature windings Yand commutator cylinders, L all. 'of saidVpartsfbeing carried on asingleshaft, The stationary magi. i

netizable members :and 'the accompanying iieldf windingsare mountedwithin a single inclosing frame insubstantially the manner described ina copending application, "Serial No.- 76,1'525`iled` February 4, 1916,by. R; E.

` Hellmund and assigned tothe Westinghouse Electric &` Manufa'cturingYCompany. The arrangement and connection ofthe several windingsV of themotor forms no partY of: the present invention which'is'limited to meansSpecicatcn of Letters Patent. Patenjged.V Apr29, 11919, applica/cionmearebmary a, 191s. semina. 715,932;

The motor comprises a frame 1 which is' provided with annular endxfianges2 and 3f and internal annularribs 4*' and; 5'; A-nnularmagnetizable members 6 and17 are suitably secured, respectlvely, betweentheflangev 2 and'rib L and i'lange* andI rib 5'; The crore, members Gand7v are composed of plates or laminations which are'spa'cedf apart atintervals vto form radiali ducts 9; The; frame 1 is further provided'vwith openings 10- located: above the ducts 9and' asubstantially central;opening 11 located at thetopof the-space 12 betweenthe ribs 4' and 5; iA sha-ft 13 is rotatably mounted in bearings (not shown) and carriesspiders 14 andv 15 which are spaced apart substantially thc samedistance as the ribs 1 and 5 'by' an` en-f larged portion 16 of theshaft and the outer ends of thehubswhiclr are engaged-V by nutsv 17 and18, respectively. The-spiders 141and 15 respectively comprise radialribs` 19 and 20 upon whichl are supported annular mag: netizablecoremembers` 21 andf22; The coreme1nbers'21 andf22` are composedofse23oplates or laminations that are assembled between end platesj24 and25iThe-sets-23 of laminations are spaced apart toform radial' passages 26that register lwith the p'assages9 ofthe coremembers and 7.l The ribs'19and' 20 of the spiders`r 14s and;` 15` are provided' with' lateralextensions 19 and; 20" that support'commutator cylinders 27 and 28'.yTheV extensions 19l and 20a are providedY with spaced radialA openings29 and 30 adacent' to Vthe* commutatorcylinders 27" andl- 28. Armaturewindings 31 and? 82 are carried! in suitable slots provided in thefcoremembers 21 and 22v and areY respectivelyconnected to the bars ofcommutator cylinders 27and 28. The coils ofthe armature windings 31' and32`have bent-over inner-end por-tions 33that project inwardly toward theshaft' 13.' Substantially L-shaped` brackets 341 support the bent-overend portions 33 of" the armature coils and also serve to inclosecross-connectors 35. The end-portions 33 and the supporting brackets 34yare so arranged that a Y space remains between the adjacent faces ofthe brackets 34. The stationary core members '6 and? .are provided withsuitablerexciting and cross-field windings 36 which are` commutatorcylinders, air chambers 39 and rotation of thearmature shaft 13 forcesthe Y Y air radially outward through the radial pas- Y 40 being thusprovided; rlhe casings 37 and v 38 are provided with air-inlet pipes 41and 42 that are connected to, 'or provided with, a suitable means forcreating a circulation of air, such, for example, as blower fans 43. Theoperation of the fans 43Y causes air to be forcedv into the chambers 39and 40 and through the spaces between the radial ribs 19 and() of thespiders 14 .and l5, respectively. An annular baffle plate 44 is mountedmidway between the hubs of the Vspiders 14 and 15 by means of asupporting ring 45 and serves to prevent the air currentswhich enter themachine from opposite ends from interfering with eachother. The

sages 26 and 9 of the core members and the openings 29 and 30 of theextensions 19a and 20"L to the outside atmosphere, thereby effectivelycooling the core members and the windings. A portion of the Ventilatingair will also pass over the outer periphery of the baffle 44 into thecentralspace 12 and out v throughV the opening 11. f Y

From the foregoing, it is apparent that the magnetizable core membersand the current-carrying; conductors; and commutat'orL Ycylindersrcarried'therebyv will be eectively cooled by the passage* of.airthrough theradialpassages and, furthermore, thatthe iii'closedVportions iof the 1cu'rrent:carryingA conducterslwhicli arelocatedbetween the' core members will be effectively cooled ,by

`the passage 'o ffa'irfthrough the central ducts.

While we have shown our invention in a Ysimple Aand preferred form andas applied to..`

aparticular type ofimotor, Vit is not so,- liinited butl is cap ablefofgeneralV applicationv :Y andissubj ect toonly such limitations as areimposed :by the appended claims.

' VWe ,claim as our vinvention z Y.

.1.l The` combination with a i vmemberslocated in spaced relation withinsaid frame, the said-members being pro-l of air, and further means fordirecting the circulation of air into said spaces from each tric machinecomprising an inclosingY frame,

a plurality of pairs of relatively rotatable members located in spacedrelation within said frame, the said members being provided -with radialpassages and therotatablemem` bers being `provided with openingsV communicating with said passages, of external means for creating. acirculation of air, 'andl further means for directingthe circulation ofair into saidopenings and radiallyoutward through said passagesand introthe space between the said members. Y

3.V The/combination with a Ydynamo-electric machine comprising aninclosing casing, relatively rotatable magnetizable members locatedwithin said casing, current-carrying conductors carried by said membersand]v partially located outside of` saidcasing and means for creating acirculation of air within said casing, of means for directing thepassage of air radially outward V through said members and over thesurfaces of theA current-carrying conductors that are located outside ofsaid casing.

4. The combination with a dynamo-electric machine comprising aninclosing casing,

relatively rotatable magnetizable membersV 'located within saidcasing,1a commutator cylinder carried by said rotatable member'surfacesof thecommutator cylinders and f said casing, and means for'creating a circu-` lation of air within said'casing, ovfgmeans fordirecting the passageiofair yradially out- `ward through Vsaidmembersjand over the surfaces of said .commutator cylinderpand Y theendportions' of saidwindingi,

5. Q Thecombination `,with ja dynai'iio-elecl tricV machine comprising.relatively rota- 'Y table magnetizable members, jwindings` for saidmembers, and a commutatorv cylinder' n carried by ,saidfrotatab-lemember,.of Vex-V ternalmeans for, creating ;a circulationq of air-andVfurther*means embodying"an'air. 1 cylinderand' Vthrough`v saidrotatable mein-gp 1 berand passages'insaid members and'.l ,ad-l1 chamberextending VVbeneath said commutator j acent'togsaid commutator cylinderfor cans;V

ing.

relatively .rotatable magnetizable meinbers located within said-casing,windings for said casing, and a commutator cylindercar-V ried by said.rotatable member and located outside of said casing, of external meansfor ing the passage of air radially outwardly;V l Y v'.l*fthroughsaidinembers and over thersiirfaces l ldynamo-electricmachine comprising an inclosing frame,

a pluralityV of'pairsof V'relatively rotatable Y 120f of said commutatorcylinderandsaid vvrfinilfjf- 6. The combination with a4 dynamo-else' Y itric machine comprising aninclosing casing, y,

Said Vmemberspartially located. Outsid bf y creating ay circulation ofair, and further means embodying an air chamber extending beneath saidcommutator cylinder and through said rotatable member and passages insaid members, for causing the passage of air radially outwardly throughsaid members and over the surfaces of said commutator cylinder and theportions of said windings located outside of said casing.

7. A dynamo-electric machine comprising an inclosing frame, a pluralityof pairs of relatively rotatable magnetizalole members located in spacedrelation within said frame, armature windings for each of the rotatablemembers, the said armature windings comprising longitudinally extendingcoils having their end portions bent laterally within the space betweenthe said members, means for forcing a cooling medium through said space,and commutator cylinders carried by the respective rotatable members atthe outer ends thereof and having their segments joined to saidwindings, respectively.

8. A dynamo-electric machine comprising an inclosing frame, a pluralityof pairs of relatively rotatable magnetizable members located in spacedrelation within said frame, armature windings for each ofthe rotatablemembers, the said armature windings comprising longitudinally extendingcoils having their end portions bent inwardly within the space betweenthe said members, means for forcing a cooling medium through said space,and commutator cylinders carried by the respective rotatable members atthe outer ends thereof, and having their segments joined to saidwindings, respeco tively.

In testimony whereof, we have hereunto subscribed our names this 29thday of Jan., 1916. l

RUDOLF E. HELLMUND. RALPH E. FERRIS.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Yatents, Washington, D. C.

